Fujitsu General AOHG45KRTA, Service Manual, Page: 117 / 154

6-12. Outdoor unit low noise operation
The compressor frequency and outdoor unit fan speed are limited to reduce the operation noise by
external input.
Low noise mode Low noise mode
Outdoor fan speed
Compressor
frequency
rpm rps
AOHG45KRTA
AOHG54KRTA
Level 1
Cooling/Dry
740 60
Heating
Level 2
Cooling/Dry
740 40
Heating
NOTES:
• During the defrost operation, the compressor operates by the speed for defrost operation.
• Even during the low noise operation, the operations of current overload, economy, and peak cut
are effective and the outdoor unit operates by lowest current of them.
Capacity priority mode
• Operation condition
The function setting is set to 1.
• Capacity check condition
– Shortage: Compressor frequency > limited compressor frequency for low noise mode
– Enough: Compressor frequency ≤ limited compressor frequency for low noise mode
• Operation
When detecting the shortage capacity or enough capacity condition continuous 30 minutes, the
mode is changed as follows:
– Automatic switching 1 (Level 1 setting)
Enough for 30 min
Shortage for 30 min
Normal operation Low noise mode 1
– Automatic switching 2 (Level 2 setting)
Low noise
mode 2
Normal
operation
Low noise
mode 1
Enough for 30 min
Shortage for 30 min
Enough for 30 min
Shortage for 30 min
6-12. Outdoor unit low noise operation
- (04-23) -
6. Various control
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS